Transform Point from Section CS into Solid(World) CS

I have a Section with a line with starting point (0,0). Now I want to get world coordinates(in the Solid CS) for this line. It may be like (100, 140, 10)

I read in the User Guide, that there is an option to transform coordinates using rotation matrix(and probably not only rotation but also shifting as long as Matrix is 4x4).

Say I have an object of pfcTransform3D class, now I have to setMatrix and then I will be able to TransformPoint

The question is: To setMatrix, I have to know coordinate system's base vectors (for xOy are (1, 0) and (0,1)) for both (target and source CS's). Where can I get these vectors for my Section and Solid (probably (1, 0, 0) and (0, 1, 0) and (0, 0, 1) ) and Shifting vector?